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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 17
Edited by: B.H.V. Topping
Paper V.1

Common-Objects: An Object Oriented Inference System Shared by Three Construction Knowledge-Bases

I. Watson, P. Brandon and A. Basden

Department of Surveying, University of Salford, Salford, England

Full Bibliographic Reference for this paper
I. Watson, P. Brandon, A. Basden, "Common-Objects: An Object Oriented Inference System Shared by Three Construction Knowledge-Bases", in B.H.V. Topping, (Editor), "Knowledge Based Systems for Civil & Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 119-125, 1993. doi:10.4203/ccp.17.5.1
This paper describes the implementation of an object-oriented inferencing mechanism that is shared by three separate knowledge-based systems. The inferencing mechanism, called the Agenda Manager, supports both goal-driven backward chaining and data-driven forward chaining through a network of objects that make up the knowledge bases. Objects in a knowledge base maintain two values or "truths"; one value they have inferred or assumed based on their own methods, and the other that can be set by a user. Moreover, there are four classes of objects in a knowledge base reflecting levels of certainty that the knowledge engineer has in how they infer their values. This division of objects is used by the knowledge engineer to focus knowledge elicitation and analysis.

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